There can be various reasons for continuity eqn divergence.
Could you give more information about your physics setup: What multiphase model are you using? Is the gas modeled as compressible? What BCs are you currently using? Are you solving this as steady state with MRF for the rotor-stator?
A few screenshots of the setup will be helpful showing the setup.Â
In the cross section plot with the methane vf, where are the inlet, impeller and outlet? Also include a picture of the mesh on this plane.
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